What characteristic of the S strain allows it to evade the immune system of the mice?
a. They are resistant to heat.
b. The cells have a capsule.
c. They are naturally competent.
d. They are genetically engineered to be resistant to killing.
Answer: b. The cells have a capsule.
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Kinesis is
A. a movement toward a stimulus. B. a movement away from a stimulus. C. a nondirectional movement in response to a stimulus D. the cessation of movement in response to a stimulus E. movement due to associative learning
It is thought by scientists that the earliest living organisms
a. originated on another planet. b. were photosynthetic. c. used carbon monoxide as a carbon source. d. used aerobic respiration. e. made use of sulfur and hydrogen gas as energy sources.
What is the original source of variation that natural selection can act upon?
A) Mutation B) Gene flow C) Genetic drift D) All of the above
Which of these microbial products is needed to produce "gasohol"?
A) citric acid B) methanol C) ethanol D) hyaluronidase E) aspartame